Sounds like a FORD rack one of the parts places should be able to use the numbers and tell you what it is .A lot of the after market people use 74-78 racks BUT they are getting harder to find so they use 79 up and the holes are different I can't remember what the hole size is . It seems like mine (a 80) has a either 5/8 or 3/4 I do know the man at PURECHOISE though I was full of it until I SENT him a line I pulled from a bone yard that fit then he made me a set of ends so I could make up some lines.
Just remember a good hose place will know what size they are IF you tell them what year rack and year and make of PUMP.